ZIP Code 94021

94021 is one of California's ZIP codes, delivering to addresses in Loma Mar, San Mateo County.

City: Loma Mar
County: San Mateo County
State: California
Prefix: 940xx

Where this code sits

94021 is part of the 940xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Loma Mar.

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 94021 delivers to without sharing its boundary.

650 Area code 650

ZIP codes nearest 94021

The ZIP codes whose reference points sit closest to 94021.
ZIP code	Distance	Delivers to
ZIP code 94020	1.7 mi	La Honda, CA
ZIP code 94074	5.6 mi	San Gregorio, CA
ZIP code 94060	6.4 mi	Pescadero, CA
ZIP code 94028	7.7 mi	Portola Valley, CA
ZIP code 94026	8.2 mi	Menlo Park, CA
ZIP code 94064	8.2 mi	Redwood City, CA
ZIP code 94062	11 mi	Redwood City, CA
ZIP code 95006	11 mi	Boulder Creek, CA

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 94021, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 94021. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.